CN105546508A - Main steam temperature control system and method for thermal power plant based on event-triggered mechanism - Google Patents
Main steam temperature control system and method for thermal power plant based on event-triggered mechanism Download PDFInfo
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Abstract
The invention discloses a main steam temperature control system and method for a heat-engine plant based on an event-triggered mechanism. The control system comprises an outer ring prediction control loop and an inner ring PID control loop, wherein the inner ring PID control loop comprises an auxiliary detecting transducer, an auxiliary controller, an actuator and an attemperator, which are connected with one another in sequence; the outer ring prediction control loop comprises a main steam temperature object, a main detecting transducer, a main controller and the whole inner ring PID control loop, which are connected with one another in sequence; the main controller comprises a reference trajectory introducer, an online corrector, an event trigger, a predicting model device, a comparator and an optimization calculator; the event trigger can screen input signals and determine whether the control signal at the current moment can be sent to the actuator or not according to judgment on event triggering conditions. The main steam temperature control system disclosed by the invention is based on the event-triggered mechanism and only sends signals meeting the conditions without affecting the system stability, so as to reduce the network transmission pressure and prolong the system life.
Description
Technical field
The invention belongs to thermal power plant's control technology field, be specifically related to a kind of thermal power plant's Control on Main-steam Temperature based on event trigger mechanism and method.
Background technology
Since reform and opening-up, economy obtains develop rapidly, also brings day by day serious environmental pollution and problems of energy consumption simultaneously.Wherein power industry is particularly serious, the particularly continuous construction of jumbo generating set, and raising operational efficiency and economy become exigence.The heat energy that thermal power generation produces when referring to fuel combustions such as utilizing coal carrys out heating water, makes water become high temperature, high-pressure steam, and then the general name generated electricity by steam pushing generator; Thermal power generation unit mainly comprises the equipment such as boiler, steam turbine, generator, coal pulverizer, primary air fan and DCS control system; Coal cinder is ground to form coal dust by coal pulverizer, the First air of certain pressure, certain flow is provided by primary air fan, coal dust is dry and send into boiler furnace, coal dust in burner hearth combustion and will discharge heat transmission feedwater, water is heated into the steam of uniform temperature and pressure, export steam turbine to, the power conversion of steam is mechanical energy by steam turbine, drives electrical power generators.Cooperation control refers to and boiler implosion and steam turbine control two subsystems integrally, is mutually controlled to cooperation, and makes boiler and steam turbine jointly adapt to the needs of network load change as soon as possible, jointly keeps unit safety, stable operation again.Wherein, Boiler Steam Temperature (i.e. Stream temperature) is the key factor affecting thermal efficiency of fossil, the too high or too low safety and economic operation that all can affect unit, the object regulating main steam temperature is that Stream temperature can maintain less fluctuation range under various operating mode, to improve the setting value of main steam temperature, and then reach the higher thermal efficiency.Along with high parameter, large sized unit progressively participate in peak load regulation network, unit load can occur significantly to change, and main steam temperature also will bear acute variation.Optimize Stream temperature forecast Control Algorithm, improve control accuracy and stability, the generation of pipe explosion accident can be reduced, improve unit varying duty capability of fast response, significant for the long-term safety of unit, economical operation.In technical development of computer today rapidly, the proposition of many advanced control methods and be applied as and herein is provided good enlightenment effect.
The Main Steam Temperature Control of current thermal power plant routine is generally in conjunction with the strategy such as feedforward compensation and cascade control system, and the method for designing of cascade control system is: its major and minor controller adopts PID (proportional-integral-differential) controller, and have larger delaying to exist with inertia due to main-stream control object, so its master controller adopts PID (proportional-integral-differential) control law, submaster controller generally adopts PI (proportional, integral) or P (ratio) control law, and submaster controller accepts leading steam temperature signal and master controller output signal.When overheating steam temperature raises, master controller exports and reduces, and submaster controller exports to be increased, and spray water flux increases, and overheating steam temperature declines.When major and minor controller all has PI control law, the input deviation of major and minor controller is zero.Therefore can think that the output of master controller is the set-point of leading steam temperature.
Please refer to Fig. 1, above-mentioned this cascade control system has inside and outside two loops, external loop is made up of Stream temperature object 10, Stream temperature transmitter (main detection transmitter) 11, master controller 12 and whole inner looping, inner looping comprises leading steam temperature transmitter (secondary detect transmitter) 20, submaster controller 21, actuator 22, Desuperheating water regulating valve 23, attemperator 24 and superheater 25,26 etc., and inner looping is the leading steam temperature exported with leading steam temperature transmitter 20 is regulated variable, a single loop control system forming for control object etc. with attemperator 24.In addition, inner looping or a following control system, need using the output of the master controller 12 of external loop as setting value, and the control utilizing the output of submaster controller 21 to control actuator 22 to realize attemperator 24.Control object because of this system is delayed with inertia less, so its control procedure is stable.When the superheater outlet vapor (steam) temperature after desuperheating water generation disturbance or attemperator 24 changes and causes leading steam temperature to change, system can adjust in time, fast and stable, reduces disturbance, particularly desuperheating water disturbance to the impact of overheating steam temperature; Relative to inner looping, external loop is a low-speed loop, and its main task maintains Stream temperature to equal set-point.Main steam temperature has complicated dynamic and close coupling characteristic.The PID of described routine controls the relation in only Focus Control loop between single input/output variable above, and cannot be compensated the relation between the input/output variable of close coupling or secondary close coupling.In actual motion, on the one hand due to the continuous adjustment of submaster controller, make the actuator frequent operations such as control valve, reduce service life; On the other hand, the main-stream control strategy of this routine, adopts preset parameter or segmentation PID orecontrolling factor device, does not consider the impact that Stream temperature changes at varying duty drag completely, control effects still can be very undesirable, had a strong impact on economy and the security of unit.
PREDICTIVE CONTROL is a kind of Computer Control Technology grown up in actual industrial process, great advantage is less demanding to model accuracy, and tracking performance is good, compare the control being applicable to complex industrial process, particularly compare the automatic control being suitable for large time delay controlled process.Main steam temperature controlled device is a Large time-delay system equally, " in advance " of PREDICTIVE CONTROL controls to be the effective means improving Main Steam Temperature Control quality, such as, Chinese patent " a kind of thermal power plant Main Steam Temperature Control method ", grant number ZL201310167926.5, proposes dynamic matrix control-PID control parameter (DMC-PID) cascade control method of main steam temperature.Fractional order PI controls to compare conventional PI and controls the setting range change of controling parameters greatly, controller can control controlled device more flexibly, control effects is better, but does not find the document, the report that traditional thermal power plant main steam temperature PID control method, PREDICTIVE CONTROL, event trigger mechanism set are applied to power plant boiler Main Steam Temperature Control in method integrally at present.
Summary of the invention
For overcoming the above problems, the invention discloses a kind of thermal power plant's Control on Main-steam Temperature based on event trigger mechanism and method, traditional thermal power plant main steam temperature PID control method, PREDICTIVE CONTROL, event trigger mechanism can be integrated, main stream temperature is optimized, the control of Stream temperature is made to have comparatively stiff stability and robustness, and decided the operation of actuator by the judgement of trigger conditions, to ensure that the stabilizing energy-saving of unit runs and service life.
The present invention adopts following design:
Based on thermal power plant's Control on Main-steam Temperature of event trigger mechanism, comprise outer shroud predictive control loop and inner ring pid control circuit, described inner ring pid control circuit comprises the pair connected successively and detects transmitter, submaster controller, actuator and attemperator, described outer shroud predictive control loop comprises the Stream temperature object connected successively, main detection transmitter, master controller and whole described inner ring pid control circuit, described master controller comprises reference trajectory introducer, on-line correction device, event trigger, forecast model device, comparator and optimization calculator, an input of described reference trajectory introducer and described on-line correction device is all connected to the output of described main detection transmitter, the output of described on-line correction device is connected to the input of described event trigger, the output of described reference trajectory introducer and described event trigger is all connected to the input of comparator, the output of described comparator is connected to the input optimizing calculator, the output of described optimization calculator is connected to the input of described submaster controller and the input of described forecast model device, the output of described forecast model device is connected to another input of described on-line correction device.
Further, in described event trigger, foundation has event triggering rule or trigger function:
G (y
p(k), y
p(k+i))=|| y
p(k)-y
p(k+i) ||-σ, wherein, G (y
p(k), y
p(k+i)) be the output signal y of current time (k+i) of described on-line correction device
p(k+i) with the output signal y in a upper moment
ptrigger function between (k), σ for belonging to the bounded positive number of (0,1), || || represent norm, i=1,2 ..., be positive integer.
Further, when described trigger function is less than or equal to 0 or the signal that receives of described event trigger current time does not meet described event triggering rule, then thinks and not " event " does not occur, the output non-output signal of described event trigger; When described trigger function is greater than 0 or the signal that receives of described event trigger current time meets described event triggering rule, then think and trigger " event ", the output of described event trigger can export the signal that described current time receives.
Further, described inner ring pid control circuit also comprises the desuperheating water pipeline that is connected with attemperator and is arranged on the desuperheat valve be connected on described desuperheating water pipeline and with described actuator.
A method for the above-mentioned thermal power plant's Control on Main-steam Temperature based on event trigger mechanism, comprises the following steps:
(1) output signal of main detection transmitter to main temperature object by working in time type of drive carries out periodic sampling;
(2) in the reference trajectory introducer that the output signal obtained sampling in step (1) is transferred to master controller and on-line correction device;
(3) described on-line correction device corrects according to the prediction signal of the described output signal received to the current time that the forecast model device of described master controller exports, and by the Signal transmissions after correcting to the event trigger of described master controller; Described reference locus line introducer determines the reference locus of described output signal according to the main temperature object setting value receiving described output signal and inside thereof simultaneously;
(4) described event trigger carries out selective output according to the trigger function of its inside or event triggering rule to the signal after described correction, and the reference locus that the result of described selective output and described reference locus line introducer export all sends into the comparator of main controller;
(5) the optimization calculator of described master controller carries out rolling optimization to the output signal of described comparator, and exports described submaster controller and described forecast model device to by optimizing the result calculated;
(6) pair by working in time type of drive detects transmitter and carries out periodic sampling to the output signal of attemperator, and the output signal obtained of sampling is transferred to described submaster controller;
(7) described submaster controller controls the action of actuator according to the output signal that the output signal of described optimization calculator and described pair detect transmitter.
Further, in described step (4), the public operational formula that described event trigger carries out selective output according to the trigger function of its inside or event triggering rule to the signal after described correction is as follows:
||x
p((k+i)h)-x
p(kh)||-σ≤0
Wherein, σ is for belonging to the normal number of (0,1), and h is the sampling period, and (k+i) h is (k+i) individual sampling period, and kh is a kth sampling period, i=1, and 2 ..., be positive integer, x
p((k+i) is h) signal that described on-line correction device exports at current time, x
p(kh) be the signal that described on-line correction device exported in a upper moment, σ is bounded positive number, || || represent norm;
And when described on-line correction device meets above-mentioned formula in the output signal of current time, then think and " event " does not occur, the output non-output signal of described event trigger, the output of described optimization calculator does not upgrade; When described on-line correction device does not meet above-mentioned formula in the output signal of current time, then think and trigger " event ", the output of described event trigger can export the output signal of described on-line correction device at current time, and the output of described optimization calculator upgrades.
Further, the reference locus that described reference trajectory introducer is determined is:
X
r((k+i) h)=a
ix
1(kh)+(1-a
i) x
d(kh), wherein, a
i=exp (-h/ λ) ∈ (0,1), h is the sampling period, and λ is time constant, x
r((k+i) is h) reference locus; x
1(kh) be the output signal of described main detection transmitter current time; x
d(kh) be the described main temperature object setting value of described current time.
Further, step (7) also comprises: described actuator regulates the desuperheat valve be arranged on the desuperheating water pipeline that is connected with described attemperator according to the control of described submaster controller, to regulate the flow flowing into the ducted desuperheating water of described desuperheating water.
Further, described submaster controller adopts PI or P control law.
Compared with prior art, the thermal power plant's Control on Main-steam Temperature based on event trigger mechanism of the present invention and method, have following beneficial effect:
(1) submaster controller of serials control can adopt traditional PI or P to control, and master controller replaces with the predictive controller based on event trigger and forecast model device, can predict according to the control inputs of system current time and historical data, obtain following output valve, then preset value compares, carry out rolling optimization to lead to obtain the current control inputs of submaster controller, submaster controller receives the output of master controller as setting value, the output signal of submaster controller is utilized to go the aperture controlling actuator and control desuperheat valve, thus realize the adjustment of attemperation water flow, main steam temperature is made to reach setting value, thus realize optimum control, the control of Stream temperature is made to have comparatively stiff stability and robustness, more actual production can be adapted to.
(2) event trigger is introduced in the host controller, event trigger is used for the event trigger mechanism rule of synchrodata and its inside received according to current time or trigger function to judge output valve, and by comparing the output valve deciding following master controller between the up-to-date output valve of event trigger and up-to-date reception value, the fluctuating range of main steam temperature can be reduced, improve regulation quality, the adjustment number of times of control valve can be reduced simultaneously, improve service life.
Accompanying drawing explanation
Figure 1 shows that the structural representation of traditional thermal power plant's main steam temperature cascade control system;
Figure 2 shows that the structural representation adding the master controller of event trigger of the specific embodiment of the invention;
Figure 3 shows that the structural representation of the Main steam temperature control system based on event trigger mechanism of the master controller shown in application drawing 2.
Detailed description of the invention
Below in conjunction with Figure of description, technical scheme of the present invention is described in detail.
Due in the thermal power plant's main steam temperature traditional control method shown in Fig. 1, the continuous adjustment of submaster controller makes the actuator frequent operations such as control valve, reduce service life, therefore in the Main steam temperature control system based on event trigger mechanism of the present invention, when considering stable and safety, pay the utmost attention to the execution number of times reducing actuator.
Figure 2 shows that the execution number of times and the structural representation adding the master controller of event trigger designed that the present invention is based on and reduce actuator.The master controller of the present invention's design, has forecast function, can predict according to the control inputs of system current time and historical data, and obtain following output valve, then preset value compares, and carries out rolling optimization to obtain current control inputs.Specifically be made up of reference trajectory introducer 121, on-line correction device 122, event trigger 123, optimization calculator 124, forecast model device 125 and comparator 126, thus realize PREDICTIVE CONTROL, feedback compensation, as required triggering, rolling optimization function.
(1) forecast model device 125 mainly realizes for the forecast model describing dynamic characteristic of the course the following control inputs value doping controlled process based on the history control inputs of controlled process according to its inside.
(2) reference trajectory introducer 121 is for determining reference locus, and namely determine that the outputting measurement value of the current time of controlled process is to the smooth curve excessively of its setting value, described curve is reference trajectory: y
r(k+i)=a
iy (k)+(1-a
i) y
d, wherein, a
i=exp (-h/ λ) ∈ (0,1), h is the sampling period, and λ is time constant; y
r(k+i) be reference locus; Y (k) is the outputting measurement value of controlled process current time; y
dfor the setting value of controlled process.
(3) on-line correction device 122 carries out feedback compensation for the outputting measurement value according to controlled process current time to the output of forecast model device 125, owing to having error e (k) to exist between the forecast model of forecast model device 125 and the outputting measurement value of controlled process current time, therefore, similar to reponse system, need to correct in time the output of forecast model device.
(4) setting of event trigger 123 is the number of times of executing the task in order to reduce the actuator in controlled process, under the prerequisite of retentive control system stability, can realize " by demand " and carry out control task thus.
Event trigger inside is set up event trigger mechanism criterion or trigger function, according to this criterion or trigger function, signal is screened, finally satisfied signal can be sent to controlled process, the action of the actuators such as the control valve in controlled process can be controlled thus.The design basic ideas of described event trigger mechanism criterion or trigger function are: calculated the functional value between the Received signal strength of current time and the output signal in a upper moment, and this value and pre-set threshold function table are carried out ask difference to compare, if be greater than zero, then think and trigger " event ", otherwise new Received signal strength is not just transmitted.The event trigger mechanism criterion defined in the present invention or trigger function are: G (y
p(k), y
p(k+i))=|| y
p(k)-y
p(k+i) ||-σ,
Wherein, y
p(k+i) signal exported after on-line correction device 122 feedback compensation that to be event trigger 123 receive at current time (k+i), y
p(kh) be the signal that event trigger 123 exports after on-line correction device 122 feedback compensation of a upper moment k reception, σ is bounded positive number, || || represent norm, i=1,2 ..., be positive integer, G (y
p(k), y
p(k+i)) be y
pand y (k+i)
p(kh) trigger function between.In this example, if trigger function is less than or equal to 0, then thinks and " event " does not occur, the signal y that event trigger 123 newly receives
p(k+i) can not export; If trigger function value is greater than 0, then thinks and there occurs " event ", the signal y that event trigger 123 can will newly receive
p(k+i)) export, for upgrading the signal optimized calculator 124 and export, regulating the action of the actuators such as the control valve of controlled process, thus whole system is controlled.In this example, parameter σ can carry out choosing of span by Liapunov stability analysis theories, and such as σ is for belonging to the normal number of (0,1).Number of run can be reduced and the stability of not influential system after adding event trigger mechanism.
(5) optimize calculator 126 and carry out rolling optimization for the output according to comparator 126: the control forecasting value optimizing the current time that calculator 126 exports is actually according to controlled process (i.e. control objectives, essence is the outputting measurement value of controlled process current time), the present situation of forecast model and whole system calculates, therefore subsequent time, optimize calculator 126 will again be optimized according to optimization aim and the system description that run, and calculate the control forecasting value of subsequent time.
Figure 3 shows that the structural representation of the thermal power plant's main steam temperature tandem Predictive Control System based on event trigger mechanism of the master controller shown in application drawing 2 of the present invention.
For thermal power plant's Control on Main-steam Temperature, the invention provides a kind of thermal power plant's Control on Main-steam Temperature based on event trigger mechanism, comprise the net control formed by outer shroud predictive control loop and inner ring pid control circuit, described inner ring pid control circuit comprises the pair connected successively and detects transmitter 20, submaster controller 21, actuator 22 and attemperator 24, described outer shroud predictive control loop comprises the Stream temperature object 10 connected successively, main detection transmitter 11, master controller 12 and whole described inner ring pid control circuit, described master controller comprises reference trajectory introducer 121, on-line correction device 122, event trigger 123, forecast model device 125, comparator 126 and optimization calculator 124, an input of described reference trajectory introducer 121 and described on-line correction device 122 is all connected to the output of described main detection transmitter 11, the output of described on-line correction device 122 is connected to the input of described event trigger 123, the output of described reference trajectory introducer 121 and described event trigger 123 is all connected to the input of comparator 126, the output of described comparator 126 is connected to the input optimizing calculator 124, the output of described optimization calculator 124 is connected to the input of described submaster controller 21 and the input of described forecast model device 125, the output of described forecast model device 125 is connected to another input of described on-line correction device 122.
In the present embodiment, master controller 12 and submaster controller 21 composed cascade predictive control strategy, submaster controller 21 adopts PI or P to control, and master controller 12 is the PREDICTIVE CONTROL of built-in event trigger 123, submaster controller 21 receives the output of master controller 12 as setting value, the output of submaster controller goes to control actuator 22, and then control the aperture of the diminishing valve (not shown in Figure 3) be connected with actuator 22, realize the adjustment of leading to the ducted attemperation water flow of desuperheating water of attemperator 24, the main steam temperature of power plant boiler is made to reach setting value, thus realize optimum control.
As from the foregoing, thermal power plant's Control on Main-steam Temperature based on event trigger mechanism of the present invention, introduce event trigger mechanism in the outer shroud predictive control loop of cascade control system, the parameter of master controller 12 is adjusted by the error of the output of forecast model and the output of process control, finally obtain the suitable and stable system that error goes to zero, the fluctuating range of main steam temperature can be reduced, improve regulation quality, the number of operations of actuator can be reduced simultaneously, namely reduce the adjustment number of times of desuperheat valve, improve the service life of actuator and desuperheat valve; In addition, thermal power plant's Control on Main-steam Temperature based on event trigger mechanism of the present invention, combine the advantage of serials control and network control, also be provided with the advantage of PREDICTIVE CONTROL simultaneously, not high to the required precision of process mathematical model, tracing property is good, has stronger robustness to error, more can adapt to actual production.
The present invention also provides a kind of thermal power plant's Control on Main-steam Temperature based on event trigger mechanism to the control method of thermal power plant's main steam temperature, comprises the following steps:
The first step: by working in the output signal y of main detection transmitter (i.e. Stream temperature transmitter) 11 pairs of Stream temperature objects (i.e. main controlled device) 11 of time type of drive
1t () carries out periodic sampling, obtain the sampled signal x of current time
1(t);
Second step: main detection transmitter 11 outputs signal x
1(kh) is to on-line correction device 122 and reference trajectory introducer 121;
3rd step: on-line correction device 122 is according to the signal x received
1(kh) to the prediction signal x of the current time that forecast model device 125 exports
m((k+i) h) corrects, and by the signal x after correction
p((k+i) h) transfers to event trigger 123; Described reference locus line introducer 121 determines its signal x received simultaneously
1(kh) to the main temperature object setting value x of its inside
d(kh) the reference locus x seamlessly transitted
r((k+i) h)=a
ix
1(kh)+(1-a
i) x
d(kh), wherein a
i=exp (-h/ λ) ∈ (0,1), h is the sampling period, and λ is time constant;
4th step: event trigger 123 according to the trigger function of its inside or event triggering rule to the signal x after described correction
p((k+i) h) carries out selective output, and the concrete formula of event trigger mechanism (i.e. trigger function or the event triggering rule) computing taked for the present invention is as follows:
||x
p((k+i)h)-x
p(kh)||-σ≤0
Wherein, σ is for belonging to the normal number of (0,1), and h is the sampling period, and (k+i) h is (k+i) individual sampling period, i=1, and 2 ..., be positive integer, x
p((k+i) is h) signal that on-line correction device 122 current time exports, x
p(kh) be the signal that a moment on on-line correction device 122 exports, || || represent norm; The signal x of twice output before and after described on-line correction device 122
p((k+i) h), x
p(kh) when meeting above-mentioned formula, then think and " event " does not occur, the output non-output signal of event trigger 123; The signal x of twice output before and after described on-line correction device 122
p((k+i) h), x
p(kh) when not meeting above-mentioned formula, then think and trigger " event ", the output of event trigger 122 can export the output signal x of described on-line correction device at current time
p((k+i) h); The reference locus x that the result of the selective output of event trigger 122 and reference locus line introducer 121 export
r((k+i) h) all sends in comparator 126;
5th step: the output signal that optimization calculator 124 pairs of comparators 126 compare carries out rolling optimization, and will the result u calculated be optimized
1(kh) export in submaster controller 21 and forecast model device 125, now, the output valve of master controller 12 is as the setting value of submaster controller 21, and forecast model device 125 can according to output u
1(kh) prediction signal of subsequent time;
6th step: the secondary output signal y detecting transmitter (i.e. leading steam temperature transmitter) 20 pairs of attemperators 24 (i.e. secondary controlled device)
2t () carries out periodic sampling, obtain the sampled signal x of current time
2(t), and the secondary transmitter 20 that detects is according to signal x
2t output signal x that () obtains
2(kh) submaster controller 21 is transferred to by inner ring pid control circuit;
7th step: submaster controller 21 is according to signal x
2and u (kh)
1(kh) export control signal and be transferred to actuator 22, thus reach the action controlling actuator 22 (desuperheat valve), particularly, when event trigger 123 no-output, optimize the Output rusults u of calculator 124
1(kh) do not upgrade, submaster controller 21 maintains the original control to actuator 22, and actuator 22 is without switching action; When event trigger 123 exports x
p((k+i) h) time, optimize the output u of calculator 124
1(kh) upgrade, submaster controller 21 controls actuator 22 again, actuator 22 switching action;
8th step: return the first step.
The foregoing is only embodiments of the invention, be not limited to the present invention, the present invention is especially applicable for long-range serials control.All within principle of the present invention, the equivalent replacement done, all should be included within protection scope of the present invention.The content that the present invention is not elaborated belongs to the known prior art of this professional domain technical staff.
Claims (9)
1. based on thermal power plant's Control on Main-steam Temperature of event trigger mechanism, it is characterized in that, comprise outer shroud predictive control loop and inner ring pid control circuit, described inner ring pid control circuit comprises the pair connected successively and detects transmitter, submaster controller, actuator and attemperator, described outer shroud predictive control loop comprises the Stream temperature object connected successively, main detection transmitter, master controller and whole described inner ring pid control circuit, described master controller comprises reference trajectory introducer, on-line correction device, event trigger, forecast model device, comparator and optimization calculator, an input of described reference trajectory introducer and described on-line correction device is all connected to the output of described main detection transmitter, the output of described on-line correction device is connected to the input of described event trigger, the output of described reference trajectory introducer and described event trigger is all connected to the input of comparator, the output of described comparator is connected to the input optimizing calculator, the output of described optimization calculator is connected to the input of described submaster controller and the input of described forecast model device, the output of described forecast model device is connected to another input of described on-line correction device.
2. thermal power plant according to claim 1 Control on Main-steam Temperature, is characterized in that, setting up in described event trigger has event triggering rule or trigger function: G (y
p(k), y
p(k+i))=|| y
p(k)-y
p(k+i) ||-σ, wherein, G (y
p(k), y
p(k+i)) be the output signal y of current time (k+i) of described on-line correction device
p(k+i) with the output signal y in a upper moment
ptrigger function between (k), σ for belonging to the bounded positive number of (0,1), || || represent norm, i=1,2 ..., be positive integer.
3. thermal power plant according to claim 2 Control on Main-steam Temperature, it is characterized in that, when described trigger function be less than or equal to 0 or described event trigger current time receive signal do not meet described event triggering rule time, then think and " event " does not occur, the output non-output signal of described event trigger; When described trigger function is greater than 0 or the signal that receives of described event trigger current time meets described event triggering rule, then think and trigger " event ", the output of described event trigger can export the signal that described current time receives.
4. thermal power plant according to claim 1 Control on Main-steam Temperature, it is characterized in that, described inner ring pid control circuit also comprises the desuperheating water pipeline that is connected with attemperator and is arranged on the desuperheat valve be connected on described desuperheating water pipeline and with described actuator.
5. a control method for the thermal power plant's Control on Main-steam Temperature based on event trigger mechanism according to any one of Claims 1-4, is characterized in that, comprise the following steps:
(1) output signal of main detection transmitter to main temperature object by working in time type of drive carries out periodic sampling;
(2) in the reference trajectory introducer that the output signal obtained sampling in step (1) is transferred to master controller and on-line correction device;
(3) described on-line correction device corrects according to the prediction signal of the described output signal received to the current time that the forecast model device of described master controller exports, and by the Signal transmissions after correcting to the event trigger of described master controller; Described reference locus line introducer determines the reference locus of described output signal according to the main temperature object setting value receiving described output signal and inside thereof simultaneously;
(4) described event trigger carries out selective output according to the trigger function of its inside or event triggering rule to the signal after described correction, and the reference locus that the result of described selective output and described reference locus line introducer export all sends into the comparator of main controller;
(5) the optimization calculator of described master controller carries out rolling optimization to the output signal of described comparator, and exports described submaster controller and described forecast model device to by optimizing the result calculated;
(6) pair by working in time type of drive detects transmitter and carries out periodic sampling to the output signal of attemperator, and the output signal obtained of sampling is transferred to described submaster controller;
(7) described submaster controller controls the action of actuator according to the output signal that the output signal of described optimization calculator and described pair detect transmitter.
6. control method according to claim 5, it is characterized in that: in described step (4), the public operational formula that described event trigger carries out selective output according to the trigger function of its inside or event triggering rule to the signal after described correction is as follows:
||x
p((k+i)h)-x
p(kh)||-σ≤0
Wherein, σ is for belonging to the normal number of (0,1), and h is the sampling period, and (k+i) h is (k+i) individual sampling period, and kh is a kth sampling period, i=1, and 2 ..., be positive integer, x
p((k+i) is h) signal that described on-line correction device exports at current time, x
p(kh) be the signal that described on-line correction device exported in a upper moment, σ is bounded positive number, || || represent norm;
And when described on-line correction device meets above-mentioned formula in the output signal of current time, then think and " event " does not occur, the output non-output signal of described event trigger, the output of described optimization calculator does not upgrade; When described on-line correction device does not meet above-mentioned formula in the output signal of current time, then think and trigger " event ", the output of described event trigger can export the output signal of described on-line correction device at current time, and the output of described optimization calculator upgrades.
7. control method according to claim 5, is characterized in that: the reference locus that described reference trajectory introducer is determined is:
X
r((k+i) h)=a
ix
1(kh)+(1-a
i) x
d(kh), wherein, a
i=exp (-h/ λ) ∈ (0,1), h is the sampling period, and λ is time constant, x
r((k+i) is h) reference locus; x
1(kh) be the output signal of described main detection transmitter current time; x
d(kh) be the described main temperature object setting value of described current time.
8. control method according to claim 5, it is characterized in that: step (7) also comprises: described actuator regulates the desuperheat valve be arranged on the desuperheating water pipeline that is connected with described attemperator according to the control of described submaster controller, to regulate the flow flowing into the ducted desuperheating water of described desuperheating water.
9. control method according to claim 5, is characterized in that: described submaster controller adopts PI or P control law.
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Address after: 239000 north of Xin'anjiang Road, east of Suzhou Road, Chuzhou economic and Technological Development Zone, Anhui Province Patentee after: Chuzhou Chuneng Thermal Power Co.,Ltd. Address before: 239000 north of Xin'anjiang Road, east of Suzhou Road, Chuzhou economic and Technological Development Zone, Anhui Province Patentee before: Chuzhou Huahui Thermal Power Co.,Ltd. |